Influence of LiCl aqueous solution concentration on the energetic performances of pure silica chabazite

Abstract

In order to study the energetic performances of different “pure silica chabazite–LiCl aqueous solution” systems, intrusion–extrusion experiments were performed under high pressure. Depending on the LiCl concentration in the aqueous medium (0 M, 5 M, 10 M, 20 M), an increase of the stored (4.4, 9.9, 13.5, 24.3 J g⁻¹) and restored (2.6, 8.1, 11.8, 20.5 J g⁻¹) energies are observed. Therefore, compared to the “pure silica CHA–H₂O” system, the stored energy is increased by 5.5 times for the “pure silica CHA–20 M LiCl” one. The zeolite samples were characterized (XRD, TG, NMR spectroscopy, N₂ adsorption and SEM) before and after the intrusion–extrusion process in order to better understand the influence of the LiCl concentration on the system behavior.